Electronics, microcontrollers, and hacks, oh my.

Arduino Wireless Communications – SIM900 GSM Shield and GSM Library

The SIMCom SIM900 GSM module isn’t very well documented (in English, at least), but it is dirt cheap. If you fancy putting cellular communications in your Arduino project, there are a few intrepid pioneers that have paved the way.

Seeedstudio sells a GSM/GPRS shield utilizing the SIM900, and have a well-developed wiki page with getting started tips, a walkthrough, and plenty of sample code.

If you’re looking for more of a drop-in solution, Open Electronics has a library to talk to a similar shield with the same SIM900 module. It’s unclear if that particular shield is still for sale, but the library should be adaptable to Seeedstudio’s version or others without too much work.